Thin 1,2,4-Triazole Films for the Inhibition of Carbon SteelCorrosion in Sulfuric Acid SolutionстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация:Etching of steel items in sulfuric acid solution is used in various human activities (oil andgas industry, metal production, utilities, transport, etc.). This operation is associated with significantmaterial costs due to corrosion losses of the metal. It has been found that an efficient way to preventcorrosion of steel in sulfuric acid solution involves the formation of thin protective films consisting ofcorrosion inhibitor molecules of triazole class on its surface. It has been shown that the protection ofsteels with a 3-substituted 1,2,4-triazole (3ST) in H2SO4 solution is accompanied by the formationof a polymolecular layer up to 4 nm thick. The 3ST layer immediately adjacent to the steel surfaceis chemisorbed on it. The efficiency of this compound as an inhibitor of corrosion and hydrogenabsorption by steel is determined by its ability to form a protective organic layer, as experimentallyconfirmed by XPS and AFM data. The kinetic constants of the main stages of hydrogen evolutionand permeation into steel in the H2SO4 solution were determined. A significant decrease in both thereaction rate of cathodic hydrogen evolution and the rate of hydrogen permeation into steel by thetriazole in question was noted. It has been shown that the preservation of the metal plasticity in theacid medium containing the triazole under study is due to a decrease in the hydrogen concentrationin the metal bulk.